Press Release - updated by Prof Anthony Purcell

A collaborative research team led by the University of Melbourne and Monash University has discovered why people develop life-threatening allergies after receiving treatment for conditions such as epilepsy and AIDS.

The finding could lead to the development of a diagnostic test to determine drug hypersensitivity.

The study published last week in the journal Nature http://www.nature.com/nature/journal/vaop/ncurrent/abs/nature11147.html revealed how some drugs inadvertently alter how the body's immune system perceives its own tissues, making them look foreign. The immune system then attacks the foreign nature of the tissues as if they were incompatible transplants. The study showed the biological mechanisms by which a person's exact tissue type determined whether they would develop the drug allergy or not.

Professor James McCluskey of the Department of Microbiology and Immunology at the University of Melbourne said this was a significant discovery uncovering the molecular basis of a group of drug hypersensitivities. "A whole class of drug allergy is likely to be explained by this discovery," said Professor McCluskey who led the study with Professor Tony Purcell from the University of Melbourne's Bio21 Institute and Professor Jamie Rossjohn from Monash University.

"There are several drugs that can cause life threatening skin rashes and other symptoms such as fever, diarrhoea, muscle aches and pains.

"A simple blood test may help to predict adverse reactions in the treatment of a broad range of conditions like AIDS, epilepsy, gout and infections."

The study was conducted by PhD student Patricia Illing, who is co-supervised by Prof's McCluskey and Purcell. She used a combination of cellular immunology, mass spectrometry and structural biology to define the changes in how the immune system recognised the body's own tissue. Critical to this work were an extensive set of experiments conducted on the high end mass spectrometry platforms which included use of the AB SCIEX 5600 TripleToF mass spectrometer. With Prof Purcell's recent recruitment to the Department of Biochemistry and Molecular Biology at Monash collaborative access to high end instruments such as the AB SCIEX TripleTOF 5600 will soon be available.

The study was done in collaboration with the Queensland Institute for Medical Research, Australia and was supported by the Australian Research Council and the National Health and Medical Research Council of Australia.